sound/soc/codecs/ac97.c

   1 /*
   2  * ac97.c  --  ALSA Soc AC97 codec support
   3  *
   4  * Copyright 2005 Wolfson Microelectronics PLC.
   5  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  * Generic AC97 support.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/kernel.h>
  18 #include <linux/device.h>
  19 #include <linux/module.h>
  20 #include <sound/core.h>
  21 #include <sound/pcm.h>
  22 #include <sound/ac97_codec.h>
  23 #include <sound/initval.h>
  24 #include <sound/soc.h>
  25
  26 static const struct snd_soc_dapm_widget ac97_widgets[] = {
  27         SND_SOC_DAPM_INPUT("RX"),
  28         SND_SOC_DAPM_OUTPUT("TX"),
  29 };
  30
  31 static const struct snd_soc_dapm_route ac97_routes[] = {
  32         { "AC97 Capture", NULL, "RX" },
  33         { "TX", NULL, "AC97 Playback" },
  34 };
  35
  36 static int ac97_prepare(struct snd_pcm_substream *substream,
  37                         struct snd_soc_dai *dai)
  38 {
  39         struct snd_soc_codec *codec = dai->codec;
  40
  41         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  42                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  43         return snd_ac97_set_rate(codec->ac97, reg, substream->runtime->rate);
  44 }
  45
  46 #define STD_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
  47                 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 |\
  48                 SNDRV_PCM_RATE_48000)
  49
  50 static const struct snd_soc_dai_ops ac97_dai_ops = {
  51         .prepare        = ac97_prepare,
  52 };
  53
  54 static struct snd_soc_dai_driver ac97_dai = {
  55         .name = "ac97-hifi",
  56         .ac97_control = 1,
  57         .playback = {
  58                 .stream_name = "AC97 Playback",
  59                 .channels_min = 1,
  60                 .channels_max = 2,
  61                 .rates = STD_AC97_RATES,
  62                 .formats = SND_SOC_STD_AC97_FMTS,},
  63         .capture = {
  64                 .stream_name = "AC97 Capture",
  65                 .channels_min = 1,
  66                 .channels_max = 2,
  67                 .rates = STD_AC97_RATES,
  68                 .formats = SND_SOC_STD_AC97_FMTS,},
  69         .ops = &ac97_dai_ops,
  70 };
  71
  72 static int ac97_soc_probe(struct snd_soc_codec *codec)
  73 {
  74         struct snd_ac97_bus *ac97_bus;
  75         struct snd_ac97_template ac97_template;
  76         int ret;
  77
  78         /* add codec as bus device for standard ac97 */
  79         ret = snd_ac97_bus(codec->component.card->snd_card, 0, soc_ac97_ops,
  80                            NULL, &ac97_bus);
  81         if (ret < 0)
  82                 return ret;
  83
  84         memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
  85         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
  86         if (ret < 0)
  87                 return ret;
  88
  89         return 0;
  90 }
  91
  92 #ifdef CONFIG_PM
  93 static int ac97_soc_suspend(struct snd_soc_codec *codec)
  94 {
  95         snd_ac97_suspend(codec->ac97);
  96
  97         return 0;
  98 }
  99
 100 static int ac97_soc_resume(struct snd_soc_codec *codec)
 101 {
 102         snd_ac97_resume(codec->ac97);
 103
 104         return 0;
 105 }
 106 #else
 107 #define ac97_soc_suspend NULL
 108 #define ac97_soc_resume NULL
 109 #endif
 110
 111 static struct snd_soc_codec_driver soc_codec_dev_ac97 = {
 112         .probe =        ac97_soc_probe,
 113         .suspend =      ac97_soc_suspend,
 114         .resume =       ac97_soc_resume,
 115
 116         .dapm_widgets = ac97_widgets,
 117         .num_dapm_widgets = ARRAY_SIZE(ac97_widgets),
 118         .dapm_routes = ac97_routes,
 119         .num_dapm_routes = ARRAY_SIZE(ac97_routes),
 120 };
 121
 122 static int ac97_probe(struct platform_device *pdev)
 123 {
 124         return snd_soc_register_codec(&pdev->dev,
 125                         &soc_codec_dev_ac97, &ac97_dai, 1);
 126 }
 127
 128 static int ac97_remove(struct platform_device *pdev)
 129 {
 130         snd_soc_unregister_codec(&pdev->dev);
 131         return 0;
 132 }
 133
 134 static struct platform_driver ac97_codec_driver = {
 135         .driver = {
 136                 .name = "ac97-codec",
 137                 .owner = THIS_MODULE,
 138         },
 139
 140         .probe = ac97_probe,
 141         .remove = ac97_remove,
 142 };
 143
 144 module_platform_driver(ac97_codec_driver);
 145
 146 MODULE_DESCRIPTION("Soc Generic AC97 driver");
 147 MODULE_AUTHOR("Liam Girdwood");
 148 MODULE_LICENSE("GPL");
 149 MODULE_ALIAS("platform:ac97-codec");